Improvement in extractors for oil-wells



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Leners Patent No. 112,142, .niet February 2s, 12in.

.IMPROYEMENTIN EXTRACTORS FOR OIL-WELLS,

The Schedulereferred to in thes'e Letters Patent and making' parl: of the same. v

I, 'HAIrr HARRIS, of Tidioute, in the county ofv Warren and Siate of ennsylvania, have invented an improved Extractor, or Grab-Tool for Oil-Wells, of which thefollowing isa specification.A

Nature and Objects of Vthe Intention.

The tool for removing obstructions from oil-wells, to which my improvements` relate, consists of' an upwardly-tapering socket, presenting anv outwardly-conoidal form, and Inade interiorly cylindrical, and which is provided with opposite longitudinal slots extendiiut;-

Afrom the base of 'its shank to within a short distance -of its lower end. v

My invention relates to the combination, with said socket and its longitudinal slots, of serrated heads or grab-jaws, lconnected hy elastic strips with a ring', the

jaws, strips, and ring being entirely,inclosedwithin` x of lig. 1, illustrating the same, with the grab-jaws of the wickers elevated and sprung open in position to be closed upon any object passing up into the socket, the dotted lines indicating the positionof the jaws when they have dropped entirely throughthe socket so far as the conning-chain will permit.

Gene/ral Description..

A is the socket, made to taper extexiorly from its lower end or mouth upwardly, and terminating in a cylindrical shank, C, cast in one piece therewith.

The interior of this socket is bored vout longitudinally and cylindrically to a'diameter about equal to that of the shank, and v.to-a depth nearly equal its vown length.

A shoulder and collar, b, is formed on the upper end of the shank C, of an octagonal or other polygonal form, so that it may be readily seized by a wrench and be screwed upon the rod by which it is to be driven and withdrawn, its upper extremity being threaded to screw into a socket in the driving-rod.

Longitudinal slots ff are out through,in the sides of the socket A, diametrically opposite each other, each extending from the base of the shank O to a point a short distance above the lower end of the socket,

Figure 2a central longitudinal section in the line x at which point they terminate with an inwardly-inclined or beveled groove, 1'. 1'., as illustrated in the drawing. f

G is the wicker-ring, made to lit and slide freely within the socket A, and whose movement within the socket is limited by means of a chain, D, secured thereto and to the head- (or upperend of the bore) ot' the socket. i

K is a spiral spring interposed between the wickerring G and the head of the socket.,

H 11 are the grab-jaws or heads ofthe wickers, for taking hold oil the object to be withdrawn'tiom the weli.- Theyare roughened or serrated upon their inner faces,` and their outer faces are inclined so as to form a gradual enlargement thereof upwardly to their thickest or widest part, as' illustrated'in the drawing, (see g. 2,) whence they are reduced with a regular slope to the thinness required in the reins k k,.which connect them with the wicker-ring G above.

.Asthere are no sudden abrupt offsets in the connection ofthe wicker-jaws with the'strips or reins k lc,which carry them, they are not liable to break olf at this pbint, as is the case in other grab-tools.

These wicker-reins 7c k work out into 'the longitudinal slots f f,so as to leave the bore of the socket entirely unobstructed. They are made of thin metal, of such a length as, that when the ring G is elevated nearly to the upper end of' the bore in the socket A, the lower ends of the wicker-jaws will just reach the ends of the inwardly-beveled grooves t' fi at the footv of each slot, as illustrated -by posit-ive lines inth' drawing, fig. 2. They are elastic, so that they spring outwardly; hence, as the wickers are drawn up they spring ont into the slots, leaving the interior of the socket perfectly free, open, and unobstructed, as illustrated in tig. 2. When', however, the wickers are forced down by the action of the confined spring K,

Vthe outer inclined facesv ofthe jaws H H workas 'wicker-rin g G is drawn up so that the wickerjaws H H may'spmng out into the ,slotted recesses t' t, and not obstruct the interior of the socket, and they arekept open and apart, andprevented from springing back, by the insertion of a small block of wood between them. The spring K is compressed by this movement so as to exertfull'pressure upon the wickerA ring to force down and close' the jaws. The socket is then driven down upon the object to be withdrawn,

so as to beforced over it.

So soon as vthe objectr has passed up far enough within the socket to displace the small block of wood, the jews H HI are thereby released, and, by the aetion of the springK bearing thereon, are forced down and wedged in upon the object so as to gripe and rmly hold the same for withdrawahtheir grasp becoming tighter in proportion to the resistance which the object presents tothe force exerted to draw it up.

IIt a firm hold is not obtained because the object,

` such ase piece of-tubing, yields to the pressure of the jaws, the socket may be jarred by repeated blows nntil the jaws close sufficiently to slip down below the end of the socket and open out, as illustrated by i ldotted lines, (see g. 2,) when their hold is released,

,. and the tool may be removed forv another trial.

The taperingv form of the socket enables'it to be used successfully in wells wherein there are crooked places in which a cylindrical socketcainnot be used.

Claims.

ing longitudinal slots f f cut therein to pei-init an outward pletyof the heads, substantially as and -for the purpose herein set forth.

last claim, the. outer ring or band L' encircling the socket, to prevent too lgreet movement of the heitds and reins, substantiallyes herein set forth.

` HART HARRIS.

Witnesses ROBERT J. OARsoN, IRAH, DAvIsoN.v

H H and their reins It lo, the inclosin'g-socket A, hav-l 3. In combination with the subject-matter ofthe y 

